So not -1. t(20)→u(21) r(18)→s(19) j(10)→k(11) m(13)→n(14) t(20)→u(21) → usknu — no. Try Atbash (a↔z, b↔y, etc.): Atbash: t(20) ↔ g(7) r(18) ↔ i(9) j(10) ↔ q(17) m(13) ↔ n(14) t(20) ↔ g(7) → giqng — no. Given the phrase length and common ciphers, this is likely a Caesar shift of +16 (or -10, same effect) because “trjmt” looks like “write” shifted.
aly → a(1)→z(26), l(12)→k(11), y(25)→x(24) → zkx
t(20) ↔ g(7) r(18) ↔ e(5) j(10) ↔ w(23) m(13) ↔ z(26) t(20) ↔ g(7) → gewzg — no, not a word. Wait — I realize: trjmt in rot13 is gewzg — nonsense. But if I instead try rot3 :